JP2013134370A - Image forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image forming apparatus able to save space while ensuring the reliable movement of an exposure member.SOLUTION: A printer 1 comprises: a body casing 2 provided with a front cover 5; a photoreceptor drum 15 provided in the body casing 2; an LED array 50 movable to an exposure position in which the array 50 is brought into close contact with the photoreceptor drum 15 so as to expose the photoreceptor drum 15 and a retreat position in which the array 50 is retreated from the photoreceptor drum 15; a slide member 61 slid with respect to the body casing 2 as the front cover 5 is opened or closed; and a moving member 62 configured to move the LED array 50 to the exposure position or retreat position by interlocking with the slide movement of the slide member 61.

Description

  The present invention relates to an image forming apparatus employing an electrophotographic system.

  As an electrophotographic image forming apparatus, an apparatus main body and a photosensitive drum are provided. A process cartridge that can be attached to and detached from the apparatus main body along the axial direction of the photosensitive drum, and an LED array head for exposing the photosensitive drum An image forming apparatus is known. In such an image forming apparatus, various configurations for retracting the LED array head have been studied in order to prevent the process cartridge and the LED array head from interfering when the process cartridge is attached to and detached from the apparatus main body. .

  For example, a holding member that holds the LED array head and is movable in the vertical direction, and is disposed adjacent to the holding member in the axial direction of the photosensitive drum, in a direction orthogonal to both the axial direction and the vertical direction of the photosensitive drum. The holding member is provided with a pin protruding along the axial direction of the photosensitive drum, and the bracket is formed with a guide hole having a tapered portion inclined obliquely upward. An image forming apparatus has been proposed (see, for example, Patent Document 1).

  In such an image forming apparatus, the holding member is moved forward and backward in the vertical direction by guiding the pin of the holding member along the inclination of the taper portion of the bracket by linear movement of the bracket, and the LED array head is It is moved to a first position close to the photosensitive drum and a second position retracted from the photosensitive drum.

JP 2001-175046 A

  However, in the image forming apparatus described in Patent Document 1, the LED array head is moved between the first position and the second position by guiding the pin of the holding member to the taper portion of the bracket by the linear movement of the bracket. It is necessary to secure a linear movement distance of the bracket corresponding to the amount of displacement of the LED array head. For this reason, it is impossible to save the space of the image forming apparatus by securing the linear motion distance.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an image forming apparatus that can save space while ensuring a reliable movement of an exposure member.

(1) In order to achieve the above-described object, the present invention provides a device main body in which a housing space is defined inside, and the housing space communicates with the outside via an opening, and is provided in the device main body. An opening / closing member movable to an open position for opening the opening portion and a closing position for closing the opening portion, and a photosensitive drum carrying the developer image. A drum unit that can be pulled out along the axial direction of the drum, and an exposure position that is provided in the apparatus main body and is close to the photosensitive drum so as to expose the photosensitive drum, and a retracted position that is retracted from the photosensitive drum. The exposure member, a slide member that is slidable along the axial direction in accordance with the opening / closing operation of the opening / closing member, and a movement that moves the exposure member to the exposure position and the retracted position by the slide movement of the slide member. It includes a moving mechanism and a member.

  The moving member is provided so as to support both ends in the axial direction of the exposure member, and the exposure member is moved from the exposure position by the sliding movement of the slide member accompanying the movement of the opening / closing member from the closed position to the open position. The exposure member is moved from the retracted position to the exposure position by moving the slide member along with the movement of the opening / closing member from the open position to the closed position.

  According to such a configuration, since the moving member is provided in addition to the sliding member, if the moving member secures the moving amount of the sliding member corresponding to the displacement amount that moves the exposure member to the exposure position and the retracted position. The exposure member can be reliably moved between the exposure position and the retracted position.

  For this reason, the amount of movement of the slide member can be reduced as compared with a configuration that does not include the moving member.

  As a result, the exposure member can be reliably moved between the exposure position and the retracted position, and space saving of the image forming apparatus can be achieved.

  Further, since the moving member is provided so as to support both ends in the axial direction of the photosensitive drum in the exposure member, both ends of the exposure member can be moved simultaneously when the exposure member is moved. .

  Therefore, the exposure member can be moved in parallel, and the exposure member can be prevented from being twisted.

  As a result, the exposure member can be prevented from being damaged, and unwanted contact between the exposure member and the photosensitive drum can be prevented. Further, it is possible to improve the relative positioning accuracy between the exposure member and the photosensitive drum at the exposure position.

In addition, since the slide member slides along the axial direction, the moving mechanism moves the exposure member to the exposure position and the retracted position. Therefore, the moving mechanism can move the axis of the drum unit or another unit (for example, the developing unit). It is possible to reduce the obstruction during the attaching / detaching operation to the apparatus main body along the direction.
(2) The exposure member may be disposed so as to face the photosensitive drum from below, and the moving mechanism may be provided below the exposure member.

  According to such a configuration, when the moving member moves the exposure member from the exposure position to the retracted position, the exposure member can be reliably positioned at the retracted position by gravity.

  On the other hand, when the moving member moves the exposure member from the retracted position to the exposure position, the moving member is provided so as to support both ends of the photosensitive drum in the axial direction of the photosensitive drum. The member can be surely positioned at the exposure position.

  Therefore, the exposure member can be reliably moved between the exposure position and the retracted position.

Further, since the moving mechanism is arranged on the opposite side of the photosensitive drum with respect to the exposure member, the moving mechanism is sufficiently separated from the drawing locus of the drum cartridge with respect to the apparatus main body. Therefore, it is possible to ensure a smooth drawing operation of the drum cartridge with respect to the apparatus main body.
(3) Further, a plurality of photosensitive drums may be provided corresponding to each of a plurality of colors, and may be arranged in parallel at intervals.

  According to such a configuration, since the photosensitive drum is provided corresponding to each of a plurality of colors (for example, yellow, magenta, cyan, and black), a full-color image can be formed.

  On the other hand, when a plurality of photosensitive drums are arranged in parallel, the image forming apparatus becomes large in the parallel direction, but in the above configuration, the moving mechanism is slid along the axial direction of the photosensitive drum of the slide member, Since the exposure member is moved to the exposure position and the retracted position, it is not necessary to secure a space for moving the exposure member in the parallel direction of the plurality of photosensitive drums.

As a result, the space between adjacent photosensitive drums can be narrowed, so that a full-color image can be formed while the image forming apparatus can be downsized.
(4) The slide member is slidable between a first position where the opening / closing member is located in the closed position and a second position where the opening / closing member is located in the open position. May be. In this case, the apparatus main body includes a biasing member that biases the slide member from the first position toward the second position.

  According to such a configuration, the slide member can be reliably slid to the first position and the second position in accordance with the opening / closing operation of the opening / closing member, although the configuration is simple.

Therefore, the opening / closing operation of the opening / closing member and the sliding movement of the slide member can be reliably linked.
(5) Further, the moving mechanism may include a holding member that holds the exposure member. In this case, the moving member has a first end fixed to the apparatus main body so as to be relatively rotatable, the other end is relatively movable along the axial direction to the holding member, and is held so as to be relatively rotatable. One link member, the first link member and the shaft portion are pivotally supported so as to be mutually rotatable, one end portion is fixed to the holding member so as to be relatively rotatable, and the other end portion is a slide member And a second link member fixed so as to be relatively rotatable.

  According to such a configuration, the crossing on the holding member side formed by the first link member and the second link member by the sliding movement of the sliding member accompanying the movement of the opening / closing member from the closed position to the open position. The first link member and the second link member are tilted so as to increase the angle, and the exposure member is moved from the exposure position to the retracted position.

  On the other hand, due to the sliding movement of the sliding member accompanying the movement of the opening / closing member from the open position to the closed position, the angle of the crossing angle on the holding member side formed by the first link member and the second link member becomes small. As described above, the first link member and the second link member are raised to move the exposure member from the retracted position to the exposure position.

  Therefore, it is possible to secure a larger amount of displacement of the moving member with respect to the amount of movement of the slide member.

  As a result, even if the movement amount of the slide member is reduced, the exposure member can be reliably moved to the exposure position and the retracted position.

  Moreover, the other end part of the 1st link member is hold | maintained at the holding member, and the one end part of the 2nd link member is being fixed to the holding member. Therefore, the holding member that holds the exposure member is supported by the first link member and the second link member. As a result, the exposure member can be moved between the retracted position and the exposure position without providing an exposure member guide or the like on the apparatus main body side.

  Therefore, further space saving of the image forming apparatus can be achieved.

  In the image forming apparatus of the present invention, it is possible to save space while ensuring the reliable movement of the exposure member.

1 is a central sectional view showing a color printer as an embodiment of an image forming apparatus of the present invention. It is AA sectional drawing of the color printer shown in FIG. It is the perspective view which looked at the moving mechanism shown in FIG. 2 from the front upper side. The disassembled perspective view of the moving mechanism shown in FIG. 3 is shown. (A) shows explanatory drawing for demonstrating the drawer | drawing-out (detachment | leave) operation | movement from the main body casing of the drum unit shown in FIG. 1, (b) shows the enlarged view of a main body side guide part.

1. Overall Configuration of Printer As shown in FIGS. 1 and 2, a printer 1 as an example of an image forming apparatus is an intermediate transfer type color printer.

In addition, the printer 1 is a multifunction device that integrally includes a main body casing 2 as an example of an apparatus main body and a flat bed scanner 3 that reads image information of a document.
(1) Main Body Casing The main body casing 2 is formed in a substantially box shape, and a main body opening 4 as an example of an opening is formed on one side wall thereof. The main casing 2 includes a front cover 5 as an example of an opening / closing member that opens and closes the main body opening 4, and a closed position (see FIG. 2) that closes the main body opening 4 with its lower end as a fulcrum. It is provided to be swingable (movable) at an open position (see FIG. 5) where the portion 4 is opened.

  In the following description, the side on which the front cover 5 is provided (the left side in FIG. 2) is the front side, and the opposite side (the right side in FIG. 2) is the rear side. In addition, when the printer 1 is viewed from the front side, the left and right reference is used.

  That is, in FIG. 1, the left side of the drawing is the left side, and the right side of the drawing is the right side. Further, the front side of the page is the front side, and the back side of the page is the rear side.

The main casing 2 feeds the paper P, the image forming unit 7 for forming an image on the fed paper P, and the paper P on which the image is formed. The paper discharge unit 8 is provided.
(2) Paper Feed Unit The paper feed unit 6 is provided at the bottom of the main casing 2 and is detachably provided with a paper feed tray 9 that accommodates the paper P (see FIG. 5A).

The paper P in the paper feed tray 9 is conveyed one by one by various rollers, and is transferred to the image forming unit 7 (between the intermediate transfer belt 24 (described later) and the secondary transfer roller 21 (described later)) at a predetermined timing. Paper is fed.
(3) Image Forming Unit The image forming unit 7 is disposed on the upper side of the paper feeding unit 6, and includes a drum unit 10, a plurality of (four) developing units 11, a plurality of (four) LED units 12, A transfer unit 13 and a fixing unit 14 are provided.
(3-1) Drum Unit The drum unit 10 is attached to the main body casing 2 so as to be drawable along the front-rear direction (see FIG. 5A).

  The drum unit 10 includes a pair of drum frames 32, a photosensitive drum 15, and a scorotron charger 16.

  The pair of drum frames 32 are formed in a substantially flat plate shape that is long in the left-right direction, and are opposed to each other with an interval in the front-rear direction (see FIG. 2).

  The drum frame 32 is formed with a detachable groove 46 corresponding to each of the plurality of developing units 11 in the lower portion thereof.

  The detachable groove 46 is formed by cutting out a portion that overlaps the upper end of the developing unit 11 when projected in the front-rear direction.

  A plurality (four) of photosensitive drums 15 are provided corresponding to a plurality of colors (black, yellow, magenta, cyan), and are arranged in parallel in the left-right direction with a space therebetween.

  The photosensitive drum 15 is formed in a substantially cylindrical shape extending in the front-rear direction (axial direction), and both front and rear ends thereof are rotatably supported by a pair of drum frames 32.

The scorotron charger 16 is provided corresponding to each of the plurality of photosensitive drums 15, and is supported by the drum frame 32 so as to be opposed to the photosensitive drum 15 with a space on the right side of the photosensitive drum 15. Yes.
(3-2) Developing Unit Each of the plurality of developing units 11 is disposed to face the lower left side of the corresponding photosensitive drum 15. The developing unit 11 includes a developing roller 17.

  The developing roller 17 is rotatably supported at the upper end of the developing unit 11 so as to be exposed from the upper side, and is in contact with the photosensitive drum 15 of the corresponding drum unit 10 from the lower left side.

  The developing unit 11 includes a supply roller 18 that supplies toner to the developing roller 17 and a layer thickness regulating blade 19 that regulates the thickness of the toner supplied to the developing roller 17. The developing unit 11 stores toner as an example of a developer below the supply roller 18.

The leftmost developing unit 11 among the plurality of developing units 11 includes a waste toner storage portion 44 for storing toner (waste toner) remaining on the surface of an intermediate transfer belt 24 (described later). ing.
(3-2) LED Unit Each of the plurality of LED units 12 is disposed below the corresponding photosensitive drum 15 so as to face the photosensitive drum 15 in the vertical direction. The LED unit 12 exposes the surface of the corresponding photosensitive drum 15 based on predetermined image data.
(3-3) Transfer Unit The transfer unit 13 includes a belt unit 20 and a secondary transfer roller 21.

  The belt unit 20 is disposed along the left-right direction so as to face all the photosensitive drums 15 from above.

  The belt unit 20 includes a driving roller 22, a driven roller 23, an intermediate transfer belt 24, a plurality (four) of primary transfer rollers 25, and a belt cleaner 37.

  The driving roller 22 and the driven roller 23 are arranged to face each other with a gap in the left-right direction.

  The intermediate transfer belt 24 is stretched around the drive roller 22 and the driven roller 23 so that the lower portion thereof is in contact with all the photosensitive drums 15. In addition, the intermediate transfer belt 24 is rotated in such a manner that the lower portion thereof is moved from the left side toward the right side by the driving of the driving roller 22 and the driven roller 23.

  Each of the plurality of primary transfer rollers 25 is provided to face the corresponding photosensitive drum 15 with the lower portion of the intermediate transfer belt 24 interposed therebetween.

  The belt cleaner 37 is provided above the left end of the intermediate transfer belt 24 and includes a belt cleaning roller 38, a counter roller 39, a relay roller 40, a scraping blade 41, and a waste toner storage unit 42.

  The toner (waste toner) remaining on the surface of the intermediate transfer belt 24 is cleaned by the belt cleaning roller 38, temporarily held by the relay roller 40, and then scraped off by the scraping blade 41. 42 is stored. The waste toner storage unit 42 is connected to the waste toner storage unit 44 via the transport pipe 43, and the waste toner stored in the waste toner storage unit 42 passes through the transport pipe 43. It is conveyed into the accommodating part 44.

The secondary transfer roller 21 is provided on the right side of the belt unit 20 so as to face the driving roller 22 of the belt unit 20 with the intermediate transfer belt 24 interposed therebetween.
(3-4) Fixing Unit The fixing unit 14 includes a heating roller 26 and a pressure roller 27 that faces the heating roller 26 and is disposed above the secondary transfer roller 21.
(3-5) Image Forming Operation (3-5-1) Developing Operation The toner in the developing unit 11 is supplied to the supply roller 18 and further supplied to the developing roller 17.

  The toner supplied to the developing roller 17 is frictionally charged positively between the supply roller 18 and the developing roller 17 as the developing roller 17 rotates, and the thickness is regulated by the layer thickness regulating blade 19. It is carried on the surface of the developing roller 17 as a thin layer having a constant thickness.

  On the other hand, the surface of the photosensitive drum 15 is uniformly positively charged by the scorotron charger 16 as the photosensitive drum 15 rotates, and then exposed by the LED unit 12. As a result, an electrostatic latent image corresponding to the image to be formed on the paper P is formed on the surface of the photosensitive drum 15.

When the photosensitive drum 15 further rotates, toner carried on the surface of the developing roller 17 is supplied to the electrostatic latent image on the photosensitive drum 15. As a result, a toner image by reversal development is carried on the surface of the photosensitive drum 15.
(3-5-2) Transfer / Fixing Operation The toner image carried on the surface of the photosensitive drum 15 is primarily transferred to the lower portion of the intermediate transfer belt 24 that is moved from the left side to the right side.

  The toner image transferred to the intermediate transfer belt 24 is secondarily transferred onto the paper P supplied from the paper supply unit 6 while the intermediate transfer belt 24 passes through a position facing the secondary transfer roller 21.

The toner image transferred onto the paper P is heat-fixed on the paper P by being heated and pressed in the fixing unit 14 while the paper P passes between the heating roller 26 and the pressure roller 27. Is done.
(4) Paper Discharge Unit A paper discharge tray 28 for discharging the paper P is formed on the upper surface of the main casing 2. The paper discharge unit 8 is formed so as to protrude above the paper discharge tray 28 at the upper right end of the main casing 2.

  In the paper discharge unit 8, a paper discharge port 29 for discharging the paper P is formed above the paper discharge tray 28. In addition, the paper discharge unit 8 includes a plurality (three) of paper discharge rollers 30 that convey the paper P to the paper discharge tray 28 in the paper discharge outlet 29.

The paper P on which the toner image has been fixed in the fixing unit 14 is discharged onto the paper discharge tray 28 by each paper discharge roller 30.
(5) Flatbed Scanner The flatbed scanner 3 is supported on the upper end of the paper discharge unit 8 with a space above the paper discharge tray 28.
2. Main Body Casing As shown in FIG. 2, the main body casing 2 includes an outer casing 33 that forms the outer shape of the printer 1, and an inner casing 34 provided inside the outer casing 33.

  The outer casing 33 is formed in a substantially box shape that is substantially rectangular in a side view, and includes a front cover 5 at the front end.

  The inner casing 34 is formed in a substantially box shape that is substantially rectangular in a side view. The inner casing 34 has a vertical length and a horizontal length that can accommodate the paper feed unit 6 (see FIG. 1) and the image forming unit 7, and is spaced apart from the outer casing 33 on the rear side. The outer casing 33 is accommodated.

  In the inner casing 34, a drum unit housing portion 36 as an example of a housing space for housing the drum unit 10 is defined.

  As shown in FIG. 1, the drum unit housing portion 36 is formed in a substantially rectangular shape in side view that can receive the drum unit 10 on the lower side of the belt unit 20.

  Further, as shown in FIG. 2, an LED support frame 35 that supports the LED unit 12 is provided in the inner casing 34.

  The LED support frame 35 is formed in a substantially flat plate shape, and is provided on the upper side of the paper feed tray 9 so as to partition the internal space of the inner casing 34.

  The LED support frame 35 is provided with a main body side guide portion 99 and a main body side fitting portion 100.

  As shown in FIG. 3, the main body side guide portion 99 has two front side main body side guide portions 99 provided to face each other with a space in the left-right direction at the front portion of the LED support frame 35 (see FIG. 2). And two rear body-side guide portions 99 provided to face each other with a gap in the left-right direction at the rear portion of the LED support frame 35 (see FIG. 2).

  Specifically, the front main body side guide portion 99 is provided corresponding to a first guide boss 76 (described later) of the slide member 61 (described later), and the rear main body side guide portion 99 is provided with the slide member 61 ( The second guide boss 80 (described later) is provided correspondingly. The front main body side guide portion 99 and the rear main body side guide portion 99 are arranged so as to coincide with the front-rear direction.

  The main body side guide portion 99 is formed in a substantially U shape in a longitudinal view in the front-rear direction, and its free end portion is fixed to the upper surface of the LED support frame 35.

  The inner dimension of the main body side guide portion 99 is formed such that the length in the front-rear direction is approximately three times the outer diameter of the first guide boss 76 (second guide boss 80) (described later). The length is substantially the same as the outer diameter of the first guide boss 76 (second guide boss 80) (described later).

  Further, in the front main body side guide portion 99 corresponding to the first guide boss 76 (described later), as shown in FIG. 5B, a compression spring 101 as an example of an urging member, a covering portion 102, and Is provided.

  The covering portion 102 is formed in a substantially cylindrical shape extending in the front-rear direction, and its front end portion is closed. The covering portion 102 is disposed so as to accommodate the front portion of the compression spring 101 therein.

  The compression spring 101 is formed in an air-core coil shape extending in the front-rear direction, a rear end portion thereof is fixed to the rear end portion of the main body side guide portion 99, and a front end portion thereof is fixed to the rear surface of the front wall of the covering portion 102. ing. The compression spring 101 and the covering portion 102 can also be provided in the rear main body side guide portion 99 corresponding to the second guide boss 80 (described later).

  As shown in FIG. 3, the main body side fitting portion 100 includes two front main body side fitting portions provided to be opposed to each other with a gap in the left-right direction behind the two front main body side guide portions 99. 100 and two rear main body side fitting portions 100 provided so as to be opposed to each other in the left-right direction behind the two rear main body side guide portions 99 (see FIG. 2). ).

  Specifically, the front main body side fitting portion 100 is provided corresponding to a rear first fitting portion 86 (described later) in the front moving member 62F (described later), and the rear main body side fitting is performed. The portion 100 is provided corresponding to the first fitting portion 86 (described later) on the rear side of the moving member 62R (described later) on the rear side.

  The main body side fitting portion 100 is formed in a substantially semicircular arc shape in side view that bulges upward from the upper surface of the LED support frame 35, and is formed in a substantially flat plate shape having a thickness in the left-right direction.

  A fitting hole 103 is formed in the center portion of the main body side fitting portion 100.

  The fitting hole 103 is formed in a substantially circular shape when viewed from the side, and is formed to penetrate in the left-right direction.

The hole diameter of the fitting hole 103 is formed to be substantially the same as the outer diameter of the first fitting portion 86 (described later).
3. LED unit The LED unit 12 includes an LED array 50 as an example of an exposure member, a first frame 51 that supports the LED array 50, and a pair of second frames 52 (see FIG. 1) that sandwich the first frame 51. And a moving mechanism 60 for moving the LED array 50.
(1) LED Array, First Frame, and Second Frame The LED array 50 is disposed at the upper end of the LED unit 12. The LED array 50 is formed in a substantially flat plate shape extending in the front-rear direction, and integrally holds a large number of LEDs arranged in parallel in the front-rear direction. The length in the front-rear direction of the LED array 50 is shorter than the length in the front-rear direction of the photosensitive drum 15 and longer than the length in the front-rear direction of the sheet passing area of the photosensitive drum 15.

  The first frame 51 is disposed below the LED array 50. The first frame 51 is formed in a substantially rectangular shape when viewed from the side, which is long in the front-rear direction. The length of the first frame 51 in the front-rear direction is shorter than the length of the photosensitive drum 15 in the front-rear direction, and is longer than the length of the LED array 50 in the front-rear direction. The first frame 51 supports the LED array 50 at its upper end.

  The first frame 51 is provided with a plurality (two) of positioning rollers 53 and a plurality (two) of compression springs 54.

  Each of the plurality of positioning rollers 53 is formed in a substantially disc shape and is rotatably supported on both front and rear end surfaces of the first frame 51. The positioning rollers 53 are provided so as to slightly protrude upward from the LED array 50 and are in contact with the left and right ends of the photosensitive drum 15 from below.

  Each of the plurality of compression springs 54 is formed in an air-core coil shape, and is disposed at both front and rear end portions on the lower surface of the first frame 51.

  The compression spring 54 has an upper end fixed to the lower surface of the first frame 51 and a lower end fixed to the upper surface of a holding member 63 (described later).

  As shown in FIGS. 1 and 2, the pair of second frames 52 are formed in a substantially flat plate shape that is long in the front-rear direction, and are spaced apart in the left-right direction so as to sandwich the first frame 51 from both the left and right sides. Opposed.

  Thus, the first frame 51 can slide and move elastically in the vertical direction between the pair of second frames 52.

  The first frame 51 is always urged upward by the compression spring 54, and the positioning roller 53 is in contact with the photosensitive drum 15.

As a result, the LED array 50 is positioned by the positioning rollers 53 so as to face the photosensitive drum 15 from below with an interval (an interval corresponding to the protruding length of the positioning rollers 53).
(2) Movement mechanism As shown in FIG. 2, the movement mechanism 60 is provided below the pair of second frames 52, that is, below the LED array 50, and includes a holding member 63, a slide member 61, And a moving member 62.
(2-1) Holding Member The holding member 63 is formed in a substantially bowl shape that is long in the front-rear direction, and supports the second frame 52 and the compression spring 54 from below (see FIG. 3). That is, the holding member 63 holds the LED array 50 via the first frame 51 and the second frame 52.

  Further, an LED side guide portion 97 and an LED side fitting portion 98 are provided on the lower surface of the holding member 63.

  As shown in FIG. 3, the LED-side guide portion 97 includes two front-side LED-side guide portions provided so as to face each other with a gap in the left-right direction at the front portion of the lower surface of the holding member 63 (see FIG. 2). 97 and two rear LED-side guide portions 97 provided so as to face each other with a gap in the left-right direction at the rear portion of the lower surface of the holding member 63 (see FIG. 2).

  Specifically, the front LED side guide portion 97 is provided corresponding to the front first fitting portion 86 (described later) in the front moving member 62F (described later), and the rear LED side guide portion 97 is The rear moving member 62R (described later) is provided corresponding to the front first fitting portion 86 (described later).

  The LED side guide portion 97 is formed in a substantially rectangular shape in a side view protruding downward from the lower surface of the holding member 63, and is formed in a substantially flat plate shape having a thickness in the left-right direction.

  Moreover, the LED side guide part 97 is arrange | positioned so that it may correspond with the main body side guide part 99, when it projects on an up-down direction.

  A guide hole 105 is formed in the center portion of the LED side guide portion 97.

  The guide hole 105 is formed in a substantially elliptical shape when viewed from the side in the longitudinal direction, and is formed to penetrate in the lateral direction.

  The guide hole 105 has a major axis that is approximately three times as long as an outer diameter of a first fitting portion 86 (described later), and a minor diameter of the guide hole 105 of the first fitting portion 86 (described later). The outer diameter is substantially the same.

  The LED-side fitting portion 98 includes two front-side LED-side fitting portions 98 provided to be opposed to each other with a space in the left-right direction behind the two front-side LED-side guide portions 97 and two rear sides. The rear LED side guide portion 97 is provided with two rear LED side fitting portions 98 provided so as to face each other with a gap in the left-right direction (see FIG. 2).

  Specifically, the front LED side fitting portion 98 is provided corresponding to the left and right ends of the second fitting portion 90 (described later) in the front moving member 62F (described later), and the rear LED side fitting portion is provided. The joint portion 98 is provided corresponding to the left and right end portions of the second fitting portion 90 (described later) in the rear moving member 62R (described later).

  The LED-side fitting portion 98 is formed in a substantially semicircular shape in side view that bulges downward from the lower surface of the holding member 63, and is formed in a substantially flat plate shape having a thickness in the left-right direction.

  Moreover, the LED side fitting part 98 is arrange | positioned so that it may correspond with the main body side fitting part 100, when it projects on an up-down direction.

  A fitting hole 106 is formed in the center portion of the LED side fitting portion 98.

  The fitting hole 106 is formed in a substantially circular shape when viewed from the side, and is formed to penetrate in the left-right direction.

The hole diameter of the fitting hole 106 is formed to be substantially the same as the outer diameter of the second fitting portion 90 (described later).
(2-2) Slide member The slide member 61 is formed in a substantially bowl shape that is long in the front-rear direction, and is slidable along the front-rear direction with respect to the main body casing 2. Is arranged.

  Specifically, as shown in FIG. 4, the slide member 61 is integrally formed from a pressed portion 65, a first engaging portion 67, a connecting portion 69, a main body portion 73, and a second engaging portion 68. Is formed.

  The pressed portion 65 is provided at the front end portion of the slide member 61 and is formed in a substantially L shape in side view.

  The first engaging portion 67 is continuously provided on the rear side of the pressed portion 65 so as to correspond to the front end portion of the second link member 83 (described later) of the front moving member 62F (described later).

  The first engagement portion 67 includes a pair of first support portions 70 and an inclined portion 71.

  The pair of first support portions 70 are formed in a substantially flat plate shape that protrudes rearward from the left and right end portions of the rear end portion of the pressed portion 65, and are opposed to each other with an interval in the left and right direction. ing.

  Further, each of the pair of first support portions 70 has an insertion hole 75 and a first guide boss 76 at the front end portion thereof.

  The insertion hole 75 is formed in a substantially circular shape in a side view facing each other, and is formed to penetrate in the left-right direction. The hole diameter of the insertion hole 75 is substantially the same as the outer diameter of the insertion shaft 94 (described later).

  The first guide boss 76 is formed in a substantially cylindrical shape that protrudes outward in the left-right direction from the peripheral end of the insertion hole 75.

  The inclined portion 71 is provided between the pair of first support portions 70 on the rear side of the insertion hole 75 (first guide boss 76), and is formed in a substantially triangular shape in a side view. Specifically, the upper surface of the inclined portion 71 is formed to be inclined upward as it goes rearward.

  The connecting portion 69 is formed in a substantially flat plate shape extending rearward from the rear end portion of the inclined portion 71 and has a cross-sectional shape that is long in the vertical direction.

  The main body portion 73 is formed in a substantially bowl shape that is long in the front-rear direction, and is formed in a substantially semicircular arc shape in a side view in which a front end portion bulges forward. And the main-body part 73 is connected with the rear-end part of the connection part 69 in the horizontal direction center part in the front-end part.

  The second engaging portion 68 is continuously provided on the rear side of the main body portion 73 so as to correspond to the front end portion of the second link member 83 (described later) in the rear moving member 62R (described later).

  The second engaging portion 68 includes a pair of second support portions 78.

  The pair of second support portions 78 are formed in a substantially flat plate shape that protrudes rearward from both left and right end portions of the rear end portion of the main body portion 73, and are opposed to each other with an interval in the left and right direction. Yes.

  Further, each of the pair of second support portions 78 has an insertion hole 79 and a second guide boss 80 at the center portion thereof.

  The insertion hole 79 is formed in a substantially circular shape in a side view facing each other, and is formed to penetrate in the left-right direction.

The second guide boss 80 is formed in a substantially cylindrical shape that protrudes outward in the left-right direction from the peripheral end of the insertion hole 79. The outer diameter of the second guide boss 80 is substantially the same as the outer diameter of the first guide boss 76.
(2-3) Moving Member As shown in FIG. 2, the moving member 62 is a pantograph mechanism, and includes a front moving member 62 (hereinafter referred to as a moving member 62F) and a rear moving member 62 (hereinafter referred to as “moving member 62F”). , A moving member 62R).

  The front side moving member 62F is provided so as to coincide with the front end portion of the LED array 50 when projected in the vertical direction, and the rear side moving member 62R is disposed behind the LED array 50 when projected in the vertical direction. It is provided so as to coincide with the end. That is, the plural (two) moving members 62 are provided so as to support the front and rear end portions of the LED array 50 via the front and rear end portions of a holding member 63 (described later).

  As shown in FIG. 4, the moving member 62 includes a pair of first link members 82 and a second link member 83.

  The pair of first link members 82 are opposed to each other with an interval in the left-right direction.

  Each of the pair of first link members 82 is formed in a substantially U shape in plan view that is opened outward in the left-right direction, and includes a first flat plate portion 85 and two first fitting portions 86. ing.

The first flat plate portion 85 is formed in a substantially flat plate shape, and the cross-sectional shape is long in the vertical direction.
A through hole 87 is formed in the central portion of the first flat plate portion 85.

  The through hole 87 is formed in a substantially circular shape when viewed from the side, and is formed to penetrate in the left-right direction. The hole diameter of the through hole 87 is formed to be substantially the same as the outer diameter of the shaft portion 95 (described later).

  The two first fitting portions 86 are provided at both front and rear end portions of the first flat plate portion 85, respectively, and are formed in a substantially cylindrical shape that protrudes outward in the left-right direction from the left-right outer surface of the first flat plate portion 85. Has been.

  The second link member 83 is formed in a substantially T shape in plan view, and includes a second flat plate portion 89 and a second fitting portion 90.

  The 2nd flat plate part 89 is formed in the substantially flat plate shape, and the cross-sectional shape is formed long in the up-down direction. The length of the second flat plate portion 89 in the longitudinal direction is substantially the same as the length of the first flat plate portion 85 in the longitudinal direction.

  The second flat plate portion 89 is formed with a through hole 91 and an insertion port 92.

  The through-hole 91 is formed in a substantially circular shape when viewed from the side in the central portion of the second flat plate portion 89. The hole diameter of the through-hole 91 is slightly larger than the outer diameter of a shaft portion 95 (described later).

  The insertion opening 92 is formed through the front end portion of the second flat plate portion 89 in a substantially circular shape when viewed from the side. The hole diameter of the insertion port 92 is formed to be slightly larger than the outer diameter of the insertion shaft 94 (described later).

  The second fitting portion 90 is formed in a substantially columnar shape extending in the left-right direction, and the center portion in the left-right direction on the front lower side is connected to the rear end portion of the second flat plate portion 89.

  As shown in FIG. 3, the pair of first link members 82 and the second link member 83 is such that the second flat plate portion 89 is substantially X-shaped in side view between the pair of first flat plate portions 85. So that the first flat plate portion 85 intersects with each other, and a substantially cylindrical shaft portion 95 is inserted into the two through holes 87 and the through ports 91 so that they can rotate with respect to each other. They are connected (see FIG. 4). That is, the pair of the first link member 82 and the second link member 83 are pivotally supported by the shaft portion 95 so as to be rotatable with respect to each other.

  Further, in the front side moving member 62F, the front end portion of the second flat plate portion 89 is disposed between the pair of first support portions 70, the two first guide bosses 76, the two insertion holes 75, and the insertion port 92. In addition, the substantially cylindrical insertion shaft 94 is inserted into the first engaging portion 67 so as to be relatively rotatable. In the front side moving member 62F, the rear end portions of the pair of first flat plate portions 85 are arranged so as to sandwich the connecting portion 69 from both sides in the left-right direction.

  Further, in the rear moving member 62R, the front end portion of the second flat plate portion 89 is disposed between the pair of second support portions 78, two second guide bosses 80, two insertion holes 79, and an insertion port. A substantially cylindrical insertion shaft 94 is inserted into the second engaging portion 68 so as to be relatively rotatable.

  Accordingly, the front end portions of the two second link members 83 are fixed to the slide member 61 so as to be relatively rotatable, and the front moving member 62F and the rear moving member 62R are connected to the slide member 61. ing.

  The slide member 61 and the moving member 62 are held by the holding member 63 and the LED support frame 35 as shown in FIG.

  Specifically, the first fitting portion 86 on the front side (upper side) of the first link member 82 is fitted into the guide hole 105 of the corresponding LED side guide portion 97 from the inner side in the left-right direction, and the first link member 82 The rear (lower) first fitting portion 86 is fitted into the fitting hole 103 of the corresponding main body side fitting portion 100 from the inner side in the left-right direction.

  Thereby, the first fitting portion 86 on the front side can be moved along the front-rear direction on the LED side guide portion 97 and is held so as to be relatively rotatable, and the first fitting portion 86 on the rear side is It is fixed to the main body side fitting portion 100 so as to be relatively rotatable.

  That is, the rear end portions of the two first link members 82 are fixed to the main body casing 2 so as to be relatively rotatable, the front end portions thereof are movable along the front-rear direction with respect to the holding member 63, and It is held rotatably.

  Each of the first guide boss 76 and the second guide boss 80 of the slide member 61 is fitted to the corresponding main body side guide portion 99 from the inner side in the left-right direction, and the second fitting portion of the second link member 83. Each of the left and right end portions 90 is fitted into the fitting hole 106 of the corresponding LED side fitting portion 98 from the inner side in the left-right direction.

  Accordingly, each of the first guide boss 76 and the second guide boss 80 is held by the main body side guide portion 99 so as to be movable in the front-rear direction, and each of the left and right end portions of the second fitting portion 90 is LED It is fixed to the side fitting portion 98 so as to be relatively rotatable.

  That is, the rear ends of the two second link members 83 are fixed to the holding member 63 so as to be relatively rotatable, and the front end portions thereof are held so as to be movable along the front-rear direction with respect to the main body casing 2. Yes.

  Thus, the front and rear end portions of the holding member 63 are supported from the lower side by the front side moving member 62F and the rear side moving member 62R, respectively.

  The slide member 61 has a first position (see FIG. 2) where the front end of the pressed portion 65 is in contact with the rear surface of the front cover 5 when the front cover 5 is in the closed position, In the state where the cover 5 is in the open position, the second end position (see FIG. 5A) where the front end portion of the pressed portion 65 is arranged to protrude outside from the main body casing 2 along the front-rear direction. It is slidably provided. That is, the slide member 61 is slidable along the front-rear direction along with the opening / closing operation of the front cover 5.

  Further, as shown in FIG. 5B, in the slide member 61, the compression spring 101 biases the first guide boss 76 (second guide boss 80) forward via the covering portion 102. Therefore, it is always biased forward so as to be arranged at the second position. That is, the compression spring 101 urges the slide member 61 from the first position toward the second position.

  As shown in FIG. 2, the moving member 62 has an intersection angle θ (holding member 63) formed by the first flat plate portion 85 and the second flat plate portion 89 in a state where the slide member 61 is disposed at the first position. The angle formed on the side) is, for example, arranged at an upright position where the upright position rises to be 60 to 120 °. At this time, the LED array 50 is disposed at an exposure position close to the photosensitive drum 15 so that the positioning roller 53 is brought into contact with the photosensitive drum 15 and the photosensitive drum 15 is exposed.

  In addition, the moving member 62 is in a tilted position that tilts toward the LED support frame 35 so that the angle of the crossing angle θ is larger than the angle in the standing position in a state where the slide member 61 is disposed at the second position. Be placed. At this time, the LED array 50 is disposed at a retracted position (see FIG. 5A) in which the positioning rollers 53 are separated from the photosensitive drum 15 and retracted from the photosensitive drum 15.

  That is, the moving member 62 moves the LED array 50 to the exposure position and the retracted position by the sliding movement of the slide member 61.

In addition, the crossing angle θ at the tilt position is, for example, 140 to 170 °. In addition, the lower end portion of the second flat plate portion 89 in the front side moving member 62F is in contact with the inclined portion 71 at the tilt position.
4). Next, attachment / detachment of the drum unit 10 to / from the main casing 2 will be described.

  As shown in FIG. 2, the slide member 61 has a compression spring 101 (see FIG. 5B) attached to the pressed portion 65 by the rear surface of the front cover 5 in a state where the front cover 5 is in the closed position. It is pressed toward the rear against the force and arranged at the first position.

  At this time, the moving member 62 is disposed at the standing position, and the LED array 50 is disposed at the exposure position.

  Then, in order to pull out (remove) the drum unit 10 attached to the main casing 2 from the main casing 2, first, as shown in FIG. 5A, the front cover 5 is opened from the closed position (see FIG. 2). The main body opening 4 is opened, and the drum unit accommodating portion 36 and the outside of the main casing 2 are communicated with each other through the main body opening 4.

  Then, the pressing by the front cover 5 against the slide member 61 is released, and the first guide boss 76 is pressed forward by the urging force of the compression spring 101, and the first guide boss 76 and the second guide boss 80 are pressed. Each is guided along the front-rear direction by the corresponding main body side guide portion 99. Accordingly, the slide member 61 is moved forward and slid along the front-rear direction from the first position to the second position.

  At this time, the front end portion of the second flat plate portion 89 in the front moving member 62F is moved forward together with the movement of the first guide boss 76, and the front end portion of the second flat plate portion 89 in the rear moving member 62R is the first end portion. 2 Along with the movement of the guide boss 80, it is moved forward.

  Then, the front first fitting portion 86 of the first link member 82 rotates relative to the LED side guide portion 97 and is moved forward in the corresponding guide hole 105 (see FIG. 3). .

  At this time, the first fitting portion 86 on the rear side rotates in the corresponding fitting hole 103 (see FIG. 3), and the second fitting portion 90 in the second link member 83 moves to the corresponding fitting hole 106. (See FIG. 2).

  Thereby, the moving member 62 is moved from the standing position to the tilted position.

  Then, the front moving member 62F simultaneously moves the front end portion of the LED array 50 and the rear moving member 62R simultaneously moves the rear end portion of the LED array 50 downward. Accordingly, the moving member 62 moves the front and rear end portions of the LED array 50 simultaneously, so that the LED array 50 is moved in parallel from the exposure position to the retracted position.

  That is, the moving member 62 moves the LED array 50 from the exposure position to the retracted position by the slide movement of the slide member 61 accompanying the movement of the front cover 5 from the closed position to the open position.

  After that, when the user applies a force to pull the drum unit 10 forward, the drum unit 10 moves downward and then forwards, and from the drum unit housing portion 36 to the outside through the main body opening 4. It is pulled out along the direction. At this time, the drum unit 10 is moved so that the attaching / detaching groove 46 of the drum frame 32 passes through the upper end portion of the developing unit 11.

  When the user further pulls the drum unit 10 forward, the drum unit 10 is detached from the main casing 2.

  Thereby, the detachment | leave from the main body casing 2 of the drum unit 10 is completed.

  Next, attachment of the drum unit 10 to the main casing 2 will be described.

  In order to attach the drum unit 10 to the drum unit housing portion 36 of the main casing 2, the drum unit 10 is operated in the reverse procedure to the above-described pull-out (detachment) operation.

  Specifically, as shown in FIG. 5A, the drum unit 10 is inserted toward the drum unit accommodation portion 36 through the main body opening 4 and is accommodated in the drum unit accommodation portion 36.

  Next, the front cover 5 is moved from the open position to the closed position.

  Then, as shown in FIG. 2, the pressed portion 65 of the slide member 61 is pressed by the front cover 5, and the slide member 61 is moved from the second position to the first position.

  At this time, as the slide member 61 moves from the second position to the first position, the moving member 62 is moved from the tilted position to the standing position.

  Then, the front-side moving member 62F moves the front end portion of the LED array 50 and the rear-side moving member 62R simultaneously moves the rear end portion of the LED array 50 upward simultaneously. Thereby, the moving member 62 moves the LED array 50 in parallel from the retracted position to the exposure position.

  At this time, the positioning roller 53 of the first frame 51 is brought into contact with the peripheral surface of the photosensitive drum 15 at the exposure position, and the LED array 50 is positioned with respect to the photosensitive drum 15.

  That is, the moving member 62 moves the LED array 50 from the retracted position to the exposure position by the sliding movement of the sliding member 61 accompanying the movement of the front cover 5 from the open position to the closed position.

Thereby, mounting | wearing to the main body casing of the drum unit 10 is completed.
5. Operation and Effect (1) According to this printer 1, as shown in FIG. 2, since the moving member 62 is provided in addition to the slide member 61, the moving member 62 moves the LED array 50 to the exposure position and the retracted position. If the movement amount of the slide member 61 corresponding to the displacement amount to be moved is ensured, the LED array 50 can be reliably moved to the exposure position and the retracted position.

  Therefore, as compared with a configuration in which the moving member 62 is not provided, the amount of movement of the slide member 61 can be reduced.

  As a result, the space of the printer 1 can be saved while the LED array 50 can be reliably moved to the exposure position and the retracted position.

  The moving member 62 includes a front moving member 62F and a rear moving member 62R. When the moving member 62 moves the LED array 50, the front moving member 62F moves to the front end of the LED array 50. The rear moving member 62R moves the rear end of the LED array 50 simultaneously.

  Therefore, the moving member 62 can move the front and rear ends of the LED array 50 simultaneously.

  As a result, the LED array 50 can be moved in parallel, and the LED array 50 can be prevented from being twisted.

  Therefore, it is possible to prevent the LED array 50 from being damaged, and to prevent unwanted contact between the LED array 50 and the photosensitive drum 15.

  Further, when the moving member 62 moves the LED array 50 from the retracted position to the exposure position, the positioning roller 53 can be reliably brought into contact with the photosensitive drum 15, so that the LED array 50 and the photosensitive drum 15 at the exposure position can be contacted. The relative positioning accuracy can be improved.

Further, when the slide member 61 slides in the front-rear direction, the moving mechanism 60 moves the LED array 50 to the exposure position and the retracted position, so that the moving mechanism 60 moves in the front-rear direction of the drum unit 10 and the developing unit 11. It is possible to reduce obstructions when attaching to and detaching from the main casing 2 along the axial direction of the photosensitive drum 15.
(2) The LED array 50 is disposed so as to face the photosensitive drum 15 from below, and the moving mechanism 60 is provided below the LED array 50.

  Therefore, as shown in FIG. 5A, when the moving member 62 moves the LED array 50 from the exposure position to the retracted position, the LED array 50 can be reliably positioned at the retracted position by gravity.

  On the other hand, as shown in FIG. 2, when the moving member 62 moves the LED array 50 from the retracted position to the exposure position, the moving member 62 is provided so as to support the front and rear end portions of the LED array 50, respectively. The LED array 50 can be reliably positioned at the exposure position against gravity.

  Therefore, the LED array 50 can be reliably moved to the exposure position and the retracted position.

  Further, as shown in FIG. 5A, the moving mechanism 60 is disposed on the opposite side of the photosensitive drum 15 with respect to the LED array 50, so that the moving mechanism 60 is sufficiently separated from the drawing locus of the drum unit 10 with respect to the main body casing 2. Has been. Therefore, it is possible to prevent the drum unit 10 and the moving mechanism 60 from interfering with each other during the pulling operation of the drum unit 10 with respect to the main body casing 2, thereby ensuring a smooth pulling operation of the drum unit 10 with respect to the main body casing 2.

  Further, since the moving mechanism 60 is disposed on the opposite side of the photosensitive drum 15 with respect to the LED array 50, the interval between the adjacent developing units 11 can be reduced (see FIG. 1).

Therefore, it is possible to reduce the size of the printer 1 in the parallel direction of the plural (four) developing units 11, that is, in the left-right direction.
(3) Further, as shown in FIG. 1, a plurality (four) of photosensitive drums 15 are provided corresponding to a plurality of colors (black, yellow, magenta, cyan), and are arranged in parallel at intervals in the left-right direction. Has been placed.

  Therefore, a full color image can be formed.

  In addition, since the moving mechanism 60 moves the LED array 50 to the exposure position and the retracted position by sliding the slide member 61 along the front-rear direction, it is necessary to secure a space for moving the LED array 50 in the left-right direction. There is no.

Therefore, the space between adjacent photosensitive drums 15 can be narrowed, and a full-color image can be formed, while the printer 1 can be further downsized.
(4) Further, as shown in FIG. 2, the slide member 61 has a first position in which the front cover 5 is located at the closed position, and the front cover 5 as shown in FIG. It is slidable to the second position arranged in the state of being in the open position. Further, as shown in FIG. 5B, the main body side guide portion 99 includes a compression spring 101 that biases the slide member 61 from the first position toward the second position.

  Therefore, the slide member 61 can be reliably slid to the first position and the second position in accordance with the opening / closing operation of the front cover 5 with a simple configuration.

As a result, the opening / closing operation of the front cover 5 and the sliding movement of the slide member 61 can be reliably linked.
(5) Moreover, the moving mechanism 60 is provided with the holding member 63 which hold | maintains the LED array 50, as shown in FIG. Further, the moving member 62 includes a pair of first link member 82 and second link member 83 as shown in FIG. The pair of first link member 82 and the second link member 83 includes a first flat plate portion 85 such that the second flat plate portion 89 is substantially X-shaped in a side view between the pair of first flat plate portions 85. They are arranged so as to intersect with each other, and are inserted into the two through holes 87 and the through holes 91 so that the substantially cylindrical shaft portions 95 are rotatably connected to each other (see FIG. 4).

  As shown in FIG. 2, the moving member 62 has an intersection angle θ (holding member 63) formed by the first flat plate portion 85 and the second flat plate portion 89 in a state where the slide member 61 is disposed at the first position. The angle formed on the side) is, for example, arranged at an upright position where the upright position rises to be 60 to 120 °. In addition, the moving member 62 is in a tilted position that tilts toward the LED support frame 35 so that the angle of the crossing angle θ is larger than the angle in the standing position in a state where the slide member 61 is disposed at the second position. Be placed.

  Therefore, due to the sliding movement of the sliding member 61 accompanying the movement of the front cover 5 from the closed position to the opened position, the moving member 62 is moved from the standing position to the tilted position, and the LED array 50 is moved away from the exposure position. Move to.

  On the other hand, due to the sliding movement of the sliding member 61 accompanying the movement of the front cover 5 from the open position to the closed position, the moving member 62 is moved from the tilted position to the standing position, and the LED array 50 is moved from the retracted position to the exposure position. Move to.

  As a result, it is possible to secure a larger amount of displacement of the moving member 62 with respect to the amount of movement of the slide member 61.

  Therefore, even if the moving amount of the slide member 61 is reduced, the LED array 50 can be reliably moved to the exposure position and the retracted position, so that further space saving of the printer 1 can be achieved.

  Further, the front moving member 62F and the rear moving member 62R are provided to support the front and rear end portions of the LED array 50 via the front and rear end portions of the holding member 63, respectively. That is, the front and rear end portions of the holding member 63 are supported from below by the front moving member 62F and the rear moving member 62R.

  Therefore, it is not necessary (or can be simplified) to provide a member for supporting the LED array 50 in addition to the holding member 63. As a result, the number of parts can be reduced, and the size of the printer 1 can be reduced, in particular, the size of the printer 1 in the left-right direction can be reduced.

DESCRIPTION OF SYMBOLS 1 Printer 2 Main body casing 4 Main body opening part 5 Front cover 10 Drum unit 15 Photosensitive drum 36 Drum unit accommodating part 50 LED array 60 Moving mechanism 61 Slide member 62 Moving member 82 1st link member 83 2nd link member 95 Shaft part 101 Compression spring

Claims (5)

An apparatus main body in which an accommodation space is partitioned and the accommodation space communicates with the outside via an opening,
An opening / closing member provided in the apparatus main body and movable to an open position for opening the opening and a closed position for closing the opening;
A drum unit that includes a photosensitive drum that carries a developer image, is housed in the housing space, and can be pulled out from the inside of the housing space to the outside along the axial direction of the photosensitive drum;
An exposure member provided in the apparatus main body, movable to an exposure position close to the photosensitive drum so as to expose the photosensitive drum, and an escape position retracted from the photosensitive drum;
A sliding member that is slidable along the axial direction along with the opening / closing operation of the opening / closing member, and a moving member that moves the exposure member to the exposure position and the retracted position by sliding movement of the slide member. A moving mechanism comprising:
The moving member is
Provided to support both ends in the axial direction of the exposure member,
With the movement of the slide member accompanying the movement of the opening / closing member from the closed position to the open position, the exposure member is moved from the exposure position to the retracted position,
An image forming apparatus, wherein the exposure member is moved from the retracted position to the exposure position by a slide movement of the slide member accompanying the movement of the opening / closing member from the open position to the closed position. . The exposure member is arranged to face the photosensitive drum from below,
The image forming apparatus according to claim 1, wherein the moving mechanism is provided below the exposure member.   The image forming apparatus according to claim 1, wherein a plurality of the photosensitive drums are provided corresponding to each of a plurality of colors, and are arranged in parallel at intervals. The slide member is
A first position arranged in a state where the opening and closing member is located in the closed position;
The open / close member is slidable to a second position disposed in the open position;
The said apparatus main body is provided with the urging member which urges | biases the said slide member toward the said 2nd position from the said 1st position, The Claim 1 thru | or 3 characterized by the above-mentioned. Image forming apparatus. The moving mechanism includes a holding member that holds the exposure member,
The moving member is
A first link member, one end of which is fixed to the apparatus main body so as to be relatively rotatable, the other end of which is relatively movable along the axial direction to the holding member, and is held so as to be relatively rotatable; ,
The first link member and the shaft portion are pivotally supported so that they can be rotated with each other, one end portion is fixed to the holding member so as to be relatively rotatable, and the other end portion is relatively rotated to the slide member. 5. The image forming apparatus according to claim 1, further comprising a second link member fixed to be possible.

Images